Michael Leonard Ontkean (born 24 January 1946) is a retired Canadian actor. Born and raised in Vancouver, British Columbia, Ontkean relocated to the United States to attend the University of New Hampshire on a hockey scholarship before pursuing a career in acting in the early 1970s.
He initially came to prominence portraying Officer Willie Gillis on the crime drama series The Rookies from 1972 to 1974, followed by lead roles in the hockey sports comedy film Slap Shot (1977) and the romantic comedy Willie & Phil (1980). In 1982, he had a starring role opposite Harry Hamlin and Kate Jackson in the drama Making Love, in which he portrayed a married man who comes to terms with his homosexuality. Ontkean continued to appear in films, such as Clara's Heart (1988) and Postcards from the Edge (1990) before being cast as Sheriff Harry S. Truman on David Lynch's Twin Peaks (1990–1991), the role for which he is probably best known.
Ontkean was born and raised in Vancouver, British Columbia, the son of Muriel (née Cooper), an actress, and Leonard Ontkean, a boxer and actor. He was a child actor in Vancouver, appearing on the Canadian television series Hudson's Bay (1959). His family later relocated to Toronto, where he attended St. Michael's Choir School and Holy Rosary Catholic School before attending St. Michael's College School. He grew up playing hockey and he earned a hockey scholarship to the University of New Hampshire, a Division I program playing in the ECAC. In his three years on the varsity program, Ontkean scored 63 goals and 111 points in 85 games played. He led the team in goal scoring his junior year with 30 goals, and was second behind fellow Canadian Louis Frigon his senior year.[citation needed]

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